Publication: Type IIC fibres in certain muscles of the adult rat (sedentary and exercised)
Authors
Morales-López, J. L. ; Agüera, E. ; Vivo, J. ; López-Rivero, J.L.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Samples were taken, at fixed levels, of the
vastus lateralis, the caput lateralis of the gastrocnemius
muscle and the longissimus lumbaris of 72 Wistar rats
which were either sedentary or subjected to various
exercise schedules. The samples were analyzed using the
histochemical technique of myosin ATPase (m-ATPase)
after preincubation at pH 4.2, and the fibre-types I, I1
(IIA and IIB) and IIC were identified, calculating the
percentage of type IIC fibres as well as their minimum
diameter.
The percentages of these IIC fibres found in the red
and mixed parts of the gastrocnemius (caput lateralis)
and the longissimus lumbaris were between 0.7% and
2.6%. However, their presence was not detected in the
vastus lateralis or in the white part of the gastrocnemius
(caput lateralis). The lack of differences in this fibre type
between the males and females of the population was
shown statistically. Likewise, no significant modification
of the IIC fibres between sedentary and exercised animals
was seen. With regard to fibrillar size, females
showed a smaller minimum diameter than males, the
results showing a small increase in the size of these fibres
in both sexes after exercise, although in most cases this
was not statistically significant.
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